Manufacture of carbon black

摘要

In the process for producing carbon black by the thermal decomposition of injected make hydrocarbons by heat absorbed from a spiralling body of hot combustion gases, the spiralling motion is induced through one or more burner chambers arranged radially round the cylindrical furnace, the gases passing in a spiralling motion in the radial chambers before injection into the furnace. The stream of gas, which may comprise an oxidizing gas and a fluid or gaseous fuel, is caused to spiral in the burner chambers; the spiral is so arranged that the gas stream is emitted along the walls of the furnace in a direction such as to induce a rotating peripheral gas wall. The make hydro-carbon may be highly aromatic, with a M.W. of 100-400 and a UOP characterization factor of 9 to 10.5. It may be axially injected into the furnace chamber in the form of an expanding conical spray. Fig. 3 represents a vertical furnace chamber 18 lined with refractory 19. Twelve burner chamber assemblies are uniformly placed round the lower end of the chamber (Fig. 4). The fluid fuel is charged into the fuel conduits 9 through the bustle pipes 28. Air is tangentially supplied to chamber 7 at 8 via bustle pipes 31. The fuel nozzle 10 is retractable and may be positioned anywhere in chamber 7 but preferably in the expanding conical exit 13. The combustion gases then spiral round the chamber walls and contact the spray of make hydrocarbon applied through nozzle 34.